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    <title>Device-Orientation example</title>
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        <a class="navbar-brand" href="./"><img src="./resources/logo-70x70.png">&nbsp;OpenLayers 3 Examples</a>
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  <div class="span12">
    <div id="map" class="map"></div>
    <div class="span12">
      <h4 id="title">Device orientation example</h4>
      <label class="checkbox" for="track">
        <input id="track" type="checkbox"/>track changes
      </label>
      <p>&alpha; : <code id="alpha"></code></p>
      <p>&beta; : <code id="beta"></code></p>
      <p>&gamma; : <code id="gamma"></code></p>
      <p>heading : <code id="heading"></code></p>
    </div>
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      <div class="row-fluid">
        <div class="span12">
          <h4 id="title">Device-Orientation example</h4>
          <p id="shortdesc">Listen to DeviceOrientation events.</p>
          <div id="docs"><p>This example shows how to track changes in device orientation.</p>
</div>
          <div id="tags">orientation, openstreetmap</div>
          <div id="api-links">Related API documentation: <ul class="inline"><li><a href="../apidoc/ol.DeviceOrientation.html" title="API documentation for ol.DeviceOrientation">ol.DeviceOrientation</a></li>,<li><a href="../apidoc/ol.Map.html" title="API documentation for ol.Map">ol.Map</a></li>,<li><a href="../apidoc/ol.View.html" title="API documentation for ol.View">ol.View</a></li>,<li><a href="../apidoc/ol.control.html" title="API documentation for ol.control">ol.control</a></li>,<li><a href="../apidoc/ol.layer.Tile.html" title="API documentation for ol.layer.Tile">ol.layer.Tile</a></li>,<li><a href="../apidoc/ol.proj.html" title="API documentation for ol.proj">ol.proj</a></li>,<li><a href="../apidoc/ol.source.OSM.html" title="API documentation for ol.source.OSM">ol.source.OSM</a></li></ul></div>
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        <form method="POST" id="jsfiddle-form" target="_blank" action="http://jsfiddle.net/api/post/jquery/1.11.0/">
          <textarea class="hidden" name="js">var projection &#x3D; ol.proj.get(&#x27;EPSG:3857&#x27;);
var view &#x3D; new ol.View({
  center: [0, 0],
  projection: projection,
  extent: projection.getExtent(),
  zoom: 2
});
var map &#x3D; new ol.Map({
  layers: [
    new ol.layer.Tile({
      source: new ol.source.OSM()
    })
  ],
  target: &#x27;map&#x27;,
  controls: ol.control.defaults({
    attributionOptions: /** @type {olx.control.AttributionOptions} */ ({
      collapsible: false
    })
  }),
  view: view
});

var deviceOrientation &#x3D; new ol.DeviceOrientation();

function el(id) {
  return document.getElementById(id);
}

el(&#x27;track&#x27;).addEventListener(&#x27;change&#x27;, function() {
  deviceOrientation.setTracking(this.checked);
});

deviceOrientation.on(&#x27;change&#x27;, function(event) {
  el(&#x27;alpha&#x27;).innerText &#x3D; deviceOrientation.getAlpha() + &#x27; [rad]&#x27;;
  el(&#x27;beta&#x27;).innerText &#x3D; deviceOrientation.getBeta() + &#x27; [rad]&#x27;;
  el(&#x27;gamma&#x27;).innerText &#x3D; deviceOrientation.getGamma() + &#x27; [rad]&#x27;;
  el(&#x27;heading&#x27;).innerText &#x3D; deviceOrientation.getHeading() + &#x27; [rad]&#x27;;
});

// tilt the map
deviceOrientation.on([&#x27;change:beta&#x27;, &#x27;change:gamma&#x27;], function(event) {
  var center &#x3D; view.getCenter();
  var resolution &#x3D; view.getResolution();
  var beta &#x3D; event.target.getBeta() || 0;
  var gamma &#x3D; event.target.getGamma() || 0;

  center[0] -&#x3D; resolution * gamma * 25;
  center[1] +&#x3D; resolution * beta * 25;

  view.setCenter(view.constrainCenter(center));
});
</textarea>
          <textarea class="hidden" name="css"></textarea>
          <textarea class="hidden" name="html">&lt;div class&#x3D;&quot;row-fluid&quot;&gt;
  &lt;div class&#x3D;&quot;span12&quot;&gt;
    &lt;div id&#x3D;&quot;map&quot; class&#x3D;&quot;map&quot;&gt;&lt;/div&gt;
    &lt;div class&#x3D;&quot;span12&quot;&gt;
      &lt;h4 id&#x3D;&quot;title&quot;&gt;Device orientation example&lt;/h4&gt;
      &lt;label class&#x3D;&quot;checkbox&quot; for&#x3D;&quot;track&quot;&gt;
        &lt;input id&#x3D;&quot;track&quot; type&#x3D;&quot;checkbox&quot;/&gt;track changes
      &lt;/label&gt;
      &lt;p&gt;&amp;alpha; : &lt;code id&#x3D;&quot;alpha&quot;&gt;&lt;/code&gt;&lt;/p&gt;
      &lt;p&gt;&amp;beta; : &lt;code id&#x3D;&quot;beta&quot;&gt;&lt;/code&gt;&lt;/p&gt;
      &lt;p&gt;&amp;gamma; : &lt;code id&#x3D;&quot;gamma&quot;&gt;&lt;/code&gt;&lt;/p&gt;
      &lt;p&gt;heading : &lt;code id&#x3D;&quot;heading&quot;&gt;&lt;/code&gt;&lt;/p&gt;
    &lt;/div&gt;
  &lt;/div&gt;
&lt;/div&gt;
</textarea>
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        </form>
        <pre><code id="example-source" class="language-markup">&lt;!DOCTYPE html&gt;
&lt;html&gt;
&lt;head&gt;
&lt;title&gt;Device-Orientation example&lt;/title&gt;
&lt;script src="https://code.jquery.com/jquery-1.11.2.min.js"&gt;&lt;/script&gt;
&lt;link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/css/bootstrap.min.css"&gt;
&lt;script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/js/bootstrap.min.js"&gt;&lt;/script&gt;
&lt;link rel="stylesheet" href="http://openlayers.org/en/v3.11.1/css/ol.css" type="text/css"&gt;
&lt;script src="http://openlayers.org/en/v3.11.1/build/ol.js"&gt;&lt;/script&gt;

&lt;/head&gt;
&lt;body&gt;
&lt;div class="container-fluid"&gt;

&lt;div class&#x3D;&quot;row-fluid&quot;&gt;
  &lt;div class&#x3D;&quot;span12&quot;&gt;
    &lt;div id&#x3D;&quot;map&quot; class&#x3D;&quot;map&quot;&gt;&lt;/div&gt;
    &lt;div class&#x3D;&quot;span12&quot;&gt;
      &lt;h4 id&#x3D;&quot;title&quot;&gt;Device orientation example&lt;/h4&gt;
      &lt;label class&#x3D;&quot;checkbox&quot; for&#x3D;&quot;track&quot;&gt;
        &lt;input id&#x3D;&quot;track&quot; type&#x3D;&quot;checkbox&quot;/&gt;track changes
      &lt;/label&gt;
      &lt;p&gt;&amp;alpha; : &lt;code id&#x3D;&quot;alpha&quot;&gt;&lt;/code&gt;&lt;/p&gt;
      &lt;p&gt;&amp;beta; : &lt;code id&#x3D;&quot;beta&quot;&gt;&lt;/code&gt;&lt;/p&gt;
      &lt;p&gt;&amp;gamma; : &lt;code id&#x3D;&quot;gamma&quot;&gt;&lt;/code&gt;&lt;/p&gt;
      &lt;p&gt;heading : &lt;code id&#x3D;&quot;heading&quot;&gt;&lt;/code&gt;&lt;/p&gt;
    &lt;/div&gt;
  &lt;/div&gt;
&lt;/div&gt;

&lt;/div&gt;
&lt;script&gt;
var projection &#x3D; ol.proj.get(&#x27;EPSG:3857&#x27;);
var view &#x3D; new ol.View({
  center: [0, 0],
  projection: projection,
  extent: projection.getExtent(),
  zoom: 2
});
var map &#x3D; new ol.Map({
  layers: [
    new ol.layer.Tile({
      source: new ol.source.OSM()
    })
  ],
  target: &#x27;map&#x27;,
  controls: ol.control.defaults({
    attributionOptions: /** @type {olx.control.AttributionOptions} */ ({
      collapsible: false
    })
  }),
  view: view
});

var deviceOrientation &#x3D; new ol.DeviceOrientation();

function el(id) {
  return document.getElementById(id);
}

el(&#x27;track&#x27;).addEventListener(&#x27;change&#x27;, function() {
  deviceOrientation.setTracking(this.checked);
});

deviceOrientation.on(&#x27;change&#x27;, function(event) {
  el(&#x27;alpha&#x27;).innerText &#x3D; deviceOrientation.getAlpha() + &#x27; [rad]&#x27;;
  el(&#x27;beta&#x27;).innerText &#x3D; deviceOrientation.getBeta() + &#x27; [rad]&#x27;;
  el(&#x27;gamma&#x27;).innerText &#x3D; deviceOrientation.getGamma() + &#x27; [rad]&#x27;;
  el(&#x27;heading&#x27;).innerText &#x3D; deviceOrientation.getHeading() + &#x27; [rad]&#x27;;
});

// tilt the map
deviceOrientation.on([&#x27;change:beta&#x27;, &#x27;change:gamma&#x27;], function(event) {
  var center &#x3D; view.getCenter();
  var resolution &#x3D; view.getResolution();
  var beta &#x3D; event.target.getBeta() || 0;
  var gamma &#x3D; event.target.getGamma() || 0;

  center[0] -&#x3D; resolution * gamma * 25;
  center[1] +&#x3D; resolution * beta * 25;

  view.setCenter(view.constrainCenter(center));
});

&lt;/script&gt;
&lt;/body&gt;
&lt;/html&gt;</code></pre>
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    <script src="./resources/prism/prism.min.js"></script>
    <script src="loader.js?id=device-orientation"></script>

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